Inteference NAT Level - 1

# Inteference NAT Level - 1

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## 10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Inteference NAT Level - 1

Inteference NAT Level - 1 for Physics 2023 is part of Topic wise Tests for IIT JAM Physics preparation. The Inteference NAT Level - 1 questions and answers have been prepared according to the Physics exam syllabus.The Inteference NAT Level - 1 MCQs are made for Physics 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Inteference NAT Level - 1 below.
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Inteference NAT Level - 1 - Question 1

### Two slits separated by a distance of 1 mm, are illuminated with red light of wavelength 6.5 x 10-7 m. The interference fringes are observed on a screen placed 1 m from the slits. Find the distance (in mm) between the third dark fringe and the fifth bright fringe on the same side of the central maxima.

Detailed Solution for Inteference NAT Level - 1 - Question 1

Hence we can use

So distance between 5th bright fringe and 3rd dark fringe

= 1.625 mm

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Inteference NAT Level - 1 - Question 2

### The path difference between two interfering waves at a point on the screen is λ/6. The ratio of intensity at this point and that at the central bright fringe will be : (Assume that intensity due to each slit in same)

Detailed Solution for Inteference NAT Level - 1 - Question 2

At path difference  phase difference is

So the required ratio is

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Inteference NAT Level - 1 - Question 3

### If the distance between the first maxima and fifth minima of a double slit pattern is 7 mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength (in nm) of the light used is :

Detailed Solution for Inteference NAT Level - 1 - Question 3

There are three and a half fringes from first maxima to fifth minima as shown

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Inteference NAT Level - 1 - Question 4

Calculate the width (in mm) of central maxima. If light of 9000 A incidents upon a slit of width 1.5 mm. Screen is kept 150 cm away from the slit.

Detailed Solution for Inteference NAT Level - 1 - Question 4

Width of central maxima

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Inteference NAT Level - 1 - Question 5

If the ratio of the intensity of two coherent sources is 4, then the visibility of the fringes is.

Detailed Solution for Inteference NAT Level - 1 - Question 5

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Inteference NAT Level - 1 - Question 6

If the relative permitivity and relative permeability of a medium are 2 & 1.28 respectively, then refractive index of the material is.

Detailed Solution for Inteference NAT Level - 1 - Question 6

Refractive Index

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Inteference NAT Level - 1 - Question 7

Two lightwaves are given by  and  The ratio intensity of first wave to that of second wave is.

Detailed Solution for Inteference NAT Level - 1 - Question 7

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Inteference NAT Level - 1 - Question 8

A light ray incidents on water  surface from air and reflected part of it is found to be polarized. Find the deviation (in degrees) of refracted light from its original path :

Detailed Solution for Inteference NAT Level - 1 - Question 8

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Inteference NAT Level - 1 - Question 9

In young’s double slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 . If we use monochromatic light of wavelength 6000 , then the number of fringes that would be obtained in the same field of view is.

Detailed Solution for Inteference NAT Level - 1 - Question 9

λ α (Fringe width)
Higher 'λ' means wider fringes.
At higher wavelength, same space on the screen is occupied by wider fringes, and hence lesser number of fringes.
Also

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Inteference NAT Level - 1 - Question 10

A single slits of width 0.1 mm is illuminated by parallel light of wavelength 6000 and diffraction bands are observed on a screen 40 cm from the slit. The distance (in mm) of third dark band from the central bright band is :

Detailed Solution for Inteference NAT Level - 1 - Question 10

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